Some styles are spring-actuated for immediate closure when flow stops.
有些类型止回阀配置弹簧驱动，能够在流动停止时，立即关闭阀门。
Limit switch, directly actuated, spring returned, normally open. Right-click for open or held closed.
限制开关，直接启动，弹簧复位，正常情况下为断路。右击断开或保持闭合。
Limit switch, directly actuated, spring returned, normally closed.
直接启动、弹簧复位、正常闭合的限制开关。
Limit switch, directly actuated, spring returned, normally open.
直接启动、弹簧复位、正常闭合的限制开关。
Limit switch, directly actuated, spring returned, normally closed.
直接启动、弹簧复位、正常闭合的邻近限制开关。
Limit switch, directly actuated, spring returned, normally closed.
直接启动、弹簧复位、正常闭合的邻近限制开关。
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